Yes, those. Ah, of course length doubles.
I am sure someone makes a "light-low, light-high" fitting.
- Spring loaded retracting unit with steel cable which handles the weight
- Curled cable which extends or contracts as necessary
Alternative is to make your own ceiling roses.
- Bulgin Mini-Buccaneer panel mount socket, plug in as needed
- Gives you an assembled length somewhat less an inline 121mm or so